Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the ______________ stress?
Correct answer: C. Proof
- A. Ultimate
- B. Yield point
- C. Proof
- D. None of these
Explanation
When no sharp yield point appears, the proof stress is defined as the stress producing a specified permanent strain, commonly 0.2%. Ultimate stress measures failure strength rather than the onset of permanent deformation.
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